The design relates to a chiller assisted cooling chilled water plant for data centers. In the system and method of the design, a fluid cooler is utilized as the primary means of heat rejection of the chilled water exiting the IT environment in the data center. After passing through the fluid cooler, if the design chilled water is above the set point, the water is passed through the water chiller where it is cooled before being pumped back to the IT environment in the data center. The design of the plant results in a reduction of the typical temperature delta between entering chilled water temperature and leaving air temperature from 10℉ to 5℉ (5.6°C to 2.8°C) increasing the number of hours of economizer cooling. An increased temperature difference between entering chilled water temperature and leaving chilled water temperature from 12℉ to 25℉ (6.7°C to 13.9°C) reduces pump energy by 50%. The use of computer room air handling units with an increase in air delta T from 20℉ to 28℉ (11.1°C to 15.6°C) using hot aisle containment (computer room heat extraction device) results in a reduction of fan energy by 25%. The use of a fluid cooler as the primary means of heat rejection of the chilled water allows for a reduction in the size of the chiller plant and emergency power plant sized by 35% which also provides lower initial cost and fuel consumption during emergency operations. Initial reduced construction costs are also attributable to a reduction in pipe and insulation material, and less copper for emergency power distribution.
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